Locking device for adjustable valves



April 21, 1925.

F'. PORSCHE- LOCKING DEVICE FOR ADJUSTABLE VLVES Filed NOV. 30, 1925 Patented Apr. Z1, 1925.

` UNITED STATES FERDINAND PORSCHE, OF STUTTGART-UNTERTURKHEIM, WRTTEMBERG, GJlRlVl'l-XNY,4

PATENT OFFICE.

ASSIGNOR TO DAIMLER-MOTREN-GESELLSCHAFT, OF STUTTGART-UNTERTURK- HEIM, WRTTEMBERG, GERMANY, A CORPORATION F GERMANY.

LOCKING DEVICE FOR ADJUSTABLE VALVES.

applicati@ fue@ November so, was. serial No. 677,754.

To all whom 'it may concern:

Be it known that I, FERDINAND PORSCHE, a citizen of the Republic of Czechoslovakia, residing at Stuttgart-Unterturkheim,Wurttemberg, Germany, Mercedesstrasse 53,have

invented certain new and useful Improvements in Locking Devices for Adjustable Valves, of which the following is a speciication. j This invention relates to a locking device Vfor adjustable valves; more especially it relates to a locking device for the adjusting members of adjustable valves, especially such as are commonly found in internal combustion engines. lNith valve-gears of the kind where the control shaft acts directly on the valve plate forming the head of the entire valve, the distance between said plate and the control cam is rendered ad- 2justable generally by having the said plate screwed into the valve-body which is made hollow for this purpose. The screw-connection between the said plate and the valvebody renders necessary a locking appliance by which a rotary motion of one of the two parts relatively to the other is prevented. .c The locking appliances employed hitherto for the purpose stated are complicated,and possessed especially of the drawback that they increase very considerably the weight.

of the valve.

The present invention consists in locking the valve parts mentioned by means of the valve vspring itself, without the use of any T othercpart or parts than such pertaining` -already' to the valve. It is hereby `rendered Vpossible to releasethe locking device without the aid or means specially provided for this purpose, and the release is effectedin a 40 very simple -manner by disconnecting the valve stem and the valve spring by depressing this latter. v Y 'My invention is `illustrated by way of example -in the accompanying `drawing in which Figure 1 is a side-view of thedevice, the valve casing and a few other parts being n shown in section; 'Figure 2 is an axial section of the entire device, the cam shown in theupper part of Figure 1 being, however, omitted; Figure 3 is a plan of the device (also without the cam), partly in horizontal section; and Figure 4 is a horizontal section-in the plane 4-4 of Figure 2.

The upper part of the stem 2 of the valve-disk 1 is provided with a threaded bore into which is screwed the stem 3 of the valve-plate or head 4, whereby it is rendered possible to vary and adjustthe distance between said plate or head and the cam 6 which latter is aiiixed to the control shaft 5. It is necessary to fit the plate 4 againstY independent rotation as otherwise the possibility exists that the distance between t'he parts 4 and 6 unintentionally alter whereby the adjustment is rendered useless.

Tn order to prevent such an occurrence the upper end 9 of the valve spring 7 is bent off so as to form a kind of hook which engages one of the gaps between teeth 8 projecting radially outwardy from the valve plate 4. The other end 10 of the spring engages a recess 14 provided in the flange 11a of a sleeve 11 which is held against independent rotary motion by inner lugs 13 engaging recesses 12a provided in the stationary guide sleeve 12 for the stem 2, the latter is in this way also prevented from rotating independently as the inner faces of the lugs 13 lie flush with flattened parts of the circumferential surface of the stem (Figure 4).

Because of the fact that the spring 7 is utilized as a locking member for the valve plate 4 it is possible to make the stem guide sleeve 12 of 'considerable greater length than has heretofore been possible. That is to say, in existing arrangements in which two contacting discs, each fastened upon a section of a divided valve spindle and engaging the customary support, are used for securingsaid valve sections, the guide sleeve,

Vsuch as 12, is shorter when the distance between the valve plate and the upper edge of the cylinder corresponds to the distance between the valve plate 4 and the upper edge of the cylinder in the present construction. Tf, in such existing constructions, a guide sleeve of the same length as the guide sleeve 12 is desired, it is necessary to increase the distance between the valve plate and the upper edge of the cylinder to an extent corresponding to the thickness of the aforesaid discs. This however materially increases the weight of the valve and renders it useless in connection with high'speed engines. This object-ion is avoided in the present invention. i

The v'valvegefai?Ican; be ij-adjifstd by `inserting :the 'spring end 9 iiito another 'of the gaps between the teeth 8 which is edected byfcompressing theyspring so -asfto vcause its end i9 to leave the Vgap in which it has been retained, when the valveep'late a can be turned in one or the other directions, as required, and the spring-'end `9 ivill Ythen be re-inserted into the gaplying just at its side. It is, thus, fo`1`"the*puipose of readjustment that the plate 'il is providedwvith avjilu'rzrlityof teeth 'such' as 8 or the like,r or lWit-li the gapsbetn'een said 'teeth lrespectively.

locking device 4for the adjusting members of adjustable vvalves,V comprising, 'jin fcombination, a `valve stem having a threaded bd1e,fatlireade d stein screwed into isaidfbre,'aplaterigidljr connected with the freefelid df said second stein andforining theliead df the valve; a. spring so arranged as to be adapted to lift said plate, Ineans Vfbr coupling the spring end which is ad- 'jacfentto' thefsaid plate with latter to resist `independent rottion of said plate and the Vsecond stern', I*and Iiieans'l preventingKI-inde pendent `rotationl of' vsaid spring. as 'set forth.

2. ,1A flocking device 'for the adjusting "members of adjustableV valves,V comprising, in combination, a valve stem havingy a threaded axial "bore, la'V threaded stem lscrewed intofsaid bore, plate rigidly connected with the'free'end of said secondst'emand forming the head of the val'veja cylindrical spring "located between saidplateand a stationary support andbeingiadpted to lift 'said' plate with its steiifr'and the first-:mentioned stein, means for coupling one end of said spring -`ivithf's'aid plate to preventindependent rotation of the latter and saidseco'ndfstem and n'eans for coupling the kother 'end of the said rsprir'ig "ivith said 1 statio'narj1 support,

asset forth. j j Y 3a. A flocking device vfor the v"adjusting 'infbers vlof"'adjus'table valves, comprising, in cr'nbination, a valve stem having a threaded'arial'bore "a threadedwsteni screwed into "s'aid jbie. 'a' plate "rigidly :connected vviththeV freeendo'f said'secnd stein *and `-formirlg the'head of the valve; a cylindrical j "Spring- 'lo'cated bet'iv'een said plateand 'a sta- 'tiarysupportand beingadapted rto lift sai'df plate with its stem# and the nist-menitioiedbtem andfeirga'ging"`vvith one of `its Aendssaid` valvefplateand `being, coupled at `its other "er'idgvvithV af'stationary member,'the

valvefplate being adapted te' bead-- justd in' various positions relatively' to and =tjo' be coupled with, the said spring, "as set frth; j p

c4. locking device 'for the adjusting 1me'iiilyeijsel adjustable valves, cemp'rjsing, combination; a :valve stem having la threaded axial bore, a threaded stern in combination, a valve stern yhavin threaded Sere-wea irasfsaid bere, a plate rigidly connected with tlie free end'of sadsecond stein and forming the head of the valve; a guide member for 'the first-mentioned valve-stem; 'a stationary sleeve 'surround- `ing said "guide-member; `a spring` surrounding said sleeve and contacting at one of itsends with ysaid valve-plate and at its vnected `vviththe free end ofthe secondstein and forming thehead of the valve; a member for the first-mentioned valve-stem,

and a recess therein; a stationarvsleevef surrounding saidI gu1de-mernbenand an internal lug projectlng throughs'aid recessand contacting wvith'the first-intentioned stem; a spring surrounding said sleeve and cionlt'cting at'one ofits endsvvitli saidvalve-plate and at its other end with the foot of said sleevej and means to coupletlie two ends f saidy spring with their adjacent parts,kas set forth. i j j V j 6: loeling device 4for the :adjusting members bf adjustable valves, comprising, in combination, a valve stem having a threaded axial bore and two oppositelj( llo,- cated flat faces near theend fitscrcurferential surface; 4a threaded stem 4screvved into said bore; "a plate rigidlyconnected with` the free `en d ofmsaid second stem and fdf'ming the head of the valve; aguide" memle'rfor the first-mentioned valve-stein, and tivo" oppositely located recesses therein a 4sanation:try

sleeve surrounding said guide-niember, and internal lugs projecting through Ysaid recessesand contacting with the Halt faces of the first-mentioned' stemr; afspring'surrouidingsaid sleeve and contacting at diie Vf its ends with said valve-plate andat itsfother end with the foot of the said 'sleevej and means to couple the tivo ends of `said""ys`1`)1"i1`1"g Withtheir adjacentparts, as"`set"'f6rth.` y

7. A locking device for the adjusting members "of adjustable valves; comprising, in combination, a valve stem Having a threaded axial bore land tvvojoppositelv 1ocated fiat faces n'e'a'rjthe 'end of itswcjrcninferential surface a Vthreaded stem screvved vinto said bore; 'a plate rigidly connected valvestein,y and Vtwo bbpbsitely `locatar-reing said gudelmernberfand prvided,`" inf its ffoot, with "fa recess and "internal lugs -pro- 'cessesthereim afstationar sleevesurroundjecting through said recesses and contacting with the flat faces of the first-mentioned stem; a cylindrical spring surrounding said sleeve and engaging with. one of its ends one of said plurality of recesses provided in the said valve-plate, and with its other end said recess in the foot of the said sleeve, substantially as described. Y

8. The combination of a support, a mechanically operated valve, a stem mounted insaid support and carrying said valve, a second stem connected with said first stem and rotatable relatively thereto for purposes of adjustment, a member fixed upon Said second stem, and a spring engaging said member for operating said valve in one direction, one of the ends of said spring being in fixed connection with said support to hold the spring against independent rotation and the other end of said spring being detachably connected with said member to prevent independent rotation of the latter and said second stem relatively to said first stem.

In testimony whereof I aflix my signature in presence of two Witnesses.

FERDINAND PORSCHE.

Witnesses:

JARvAN BAUER, HOWARD TAYLOR. 

